Wired News has a Reuters story on increasing use of Linux in the digital effects industry. Since those guys are mainly looking for raw computing power, and their software runs on some UNIX-variant most of the time anyway, it makes sense to go the cheapest route possible. Linux and commodity hardware are as good a choice as any from that perspective.
O’ReillyNet has posted the transcript from the Open Source vs. Shared Source panel at the Open Source Conference.